Published: Jan 2000
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Construction quality control testing is critical in ensuring that compacted fills are properly placed. One element in the successful implementation of compacted fill placement is the appropriate assignment of optimum moisture-density values for varying fill material types encountered during construction. For decades the U.S. Bureau of Reclamation (USBR) has acquired laboratory moisture-density test data for a variety of material types from the 17 western states in which the USBR operates. A comparison between optimum moisture-density data published by the USBR is made with laboratory test results obtained from years of quality control testing of compacted fills on commercial projects throughout the Denver-Metro area. Optimum moisture content-maximum dry density curves are presented which provide a visual representation of the variability in the data which can be anticipated for each soil type evaluated. This data provides confirmation of the USBR database and can be used in estimating appropriate moisture content-dry density values, evaluating the validity of laboratory compaction test results obtained, as well as assessing the state of compaction of in-place fill material.
quality control testing, compacted fills, optimum moisture-density, construction control
Senior Engineer, CTC-Geotek, Inc., Denver, CO